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<font face="Times New Roman">Hi Charlotte,<br>
<br>
Congratulations! you managed to crack the intended use of "rip" in
spite of what I thought was a scheme so complicated, that no mere
mortal could be expected to decipher it.<br>
<br>
That being said, I think we should probably expect others (with
lesser proclivity to meticulousness) to fail in attempting to
follow the recommendations. In particular, we may not be able to
count on the "p" and "i" values being consistent across all
simulations by a single model. If that were the case, would it
completely disrupt your plans?<br>
<br>
One approach would be as follows:<br>
The first time that someone records the information for an
experiment (i.e., the first member of the "rip" ensemble), they
would be asked to document the model and all the experimental
conditions. Then when subsequent members were entered, they
should only have to reference the first member and say how the
model physics (in some cases when p differs) or the experiment
conditions (initial conditions when "i" differs and in some cases
"forcing" when "p" differs). In the case of a different value of
"r", typically the "spawning" point from the run will differ from
one member of the ensemble to another. [Note, however, that for
the TAMIP project, this identifies a different start time for the
forecast within the season.] <br>
<br>
Sorry it's so difficult.<br>
<br>
Best regards,<br>
Karl<br>
</font><br>
On 2/1/11 6:09 AM, <a class="moz-txt-link-abbreviated" href="mailto:charlotte.pascoe@stfc.ac.uk">charlotte.pascoe@stfc.ac.uk</a> wrote:
<blockquote
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<p class="MsoNormal">Hi Karl and Bryan, <o:p></o:p></p>
<p class="MsoNormal">It is important to know how the r<N><span
class="SpellE">i</span><M>p<L>
<span style=""> </span>indices are to be implemented in CMIP5
so that we can be sure that information about them is captured
correctly by the questionnaire.
<span style=""> </span>Here is my understanding, please
correct me if I’m wrong!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The scope of the p<L> and <span
class="SpellE">i</span><M> indices are model wide –
these indices must mean the same thing across all simulations
for a particular model.<o:p></o:p></p>
<p class="MsoNormal">The scope of the r<N> indices are
experiment wide – <span style="">
</span>the r index is not required to mean the same thing
across all simulations for a particular model, so the r
indices can be reused by different experiments.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here is an example to show what this would
mean in practice.
<o:p></o:p></p>
<p class="MsoNormal">If the meaning <span style=""> </span>of
the r<N> indices were confined to
<span style=""> </span>an experiment <o:p></o:p></p>
<p class="MsoNormal">then if you had used r1, r2, and r3 to
label the members of an
<span class="SpellE">amip</span> ensemble:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 36pt;">tas_day_HADCM3_amip_r1i1p1_197901-200901.nc<o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 36pt;">tas_day_HADCM3_amip_r2i1p1_197901-200901.nc<o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 36pt;">tas_day_HADCM3_amip_r3i1p1_197901-200901.nc<o:p></o:p></p>
<p class="MsoNormal">you could use r1,r2 and r3 again to label
the members of a different experiment, say decadal2000:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 36pt;">tas_day_HADCM3_decadal2000_r1i2p1_200001-201001.nc<o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 36pt;">tas_day_HADCM3_decadal2000_r2i2p1_200001-201001.nc<o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 36pt;">tas_day_HADCM3_decadal2000_r3i2p1_200001-201001.nc<o:p></o:p></p>
<p class="MsoNormal">rather than having to begin labelling from
a new r index, say r4:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 36pt;">tas_day_HADCM3_decadal2000_r4i2p1_200001-201001.nc<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Where<o:p></o:p></p>
<p class="MsoNormal">p<L> - identify perturbations in
physics (from the same base model)
<o:p></o:p></p>
<p class="MsoNormal"><span class="SpellE">i</span><M> -
identify perturbations in initialisation method<o:p></o:p></p>
<p class="MsoNormal">r<N> - identify ensemble members
which differ in other characteristics.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please shout if my interpretation is wrong!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style=""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom: 6pt; text-align:
justify;"><b><span style="font-size: 14pt; font-family:
"Lucida Handwriting"; color: rgb(51, 51, 204);">Charlotte<o:p></o:p></span></b></p>
<p class="MsoNormal" style=""><span style="font-size: 9pt;
font-family: "Arial","sans-serif";
color: rgb(89, 89, 89);">----------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span style="font-size: 9pt;
font-family: "Arial","sans-serif";
color: rgb(89, 89, 89);">Dr Charlotte Pascoe<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span style="font-size: 9pt;
font-family: "Arial","sans-serif";
color: rgb(89, 89, 89);">NCAS British Atmospheric Data
Centre<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span style="font-size: 9pt;
font-family: "Arial","sans-serif";
color: rgb(89, 89, 89);">STFC Rutherford Appleton Laboratory<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span style="font-size: 9pt;
font-family: "Arial","sans-serif";
color: rgb(89, 89, 89);">Phone +44 1235 445869; Fax ...5848<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span style="font-size: 9pt;
font-family: "Arial","sans-serif";
color: rgb(89, 89, 89);">e-mail</span><span
style="font-size: 9pt; font-family:
"Arial","sans-serif";">
<a moz-do-not-send="true" href="mailto:c.l.pascoe@rl.ac.uk"><span
style="color: blue;">charlotte.pascoe@stfc.ac.uk</span></a><o:p></o:p></span></p>
<p class="MsoNormal" style=""><span style="font-size: 9pt;
font-family: "Arial","sans-serif";
color: rgb(89, 89, 89);">----------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span style=""><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<br>
<p>-- <br>
Scanned by iCritical.
</p>
<br>
</blockquote>
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